body {
  margin: 0;
  padding: 0;
  background-color: #cdcdcd;
}

ul {
  padding: 0;
}
a {
  text-decoration: none;
}

li {
  list-style: none;
}

input {
  outline: none;
  border: 0;
}

button {
  border: 0;
  cursor: pointer;
}
/* 版心 */
.center {
  width: 620px;
  height: 100%;
  margin: 0 auto;
  padding: 0 10px;
  /* background-color: pink; */
}
